Final answer:
Apparent brightness is the measure of how bright an object appears in the sky. It depends on the luminosity and distance of the object.
Step-by-step explanation:
Apparent brightness is a measure of the amount of light received by Earth from a star or other object, and refers to how bright an object appears in the sky. It is different from luminosity, which is the total energy output of a star. Apparent brightness depends on both the luminosity and distance of the object from Earth. To measure apparent brightness, astronomers use a process called photometry, which involves estimating the relative brightness of stars through cataloging their positions and apparent brightnesses.